Disconnector with ground blade and method of operation thereof

Abstract

The application discloses an isolating switch with a grounding knife and an operating method thereof, which comprises a base frame, an isolating knife and a grounding knife, wherein the isolating knife and the grounding knife are arranged on the base frame; a direct-current speed reduction motor is arranged on one side of the base frame; a grounding knife driving gear set is connected with an output end of the direct-current speed reduction motor; an isolating knife driving shaft and a grounding knife driving shaft are rotatably arranged on the base frame and are respectively provided with the isolating knife and the grounding knife; the grounding knife driving shaft is connected with the grounding knife driving gear set; a transmission assembly is connected with the isolating knife driving shaft and the grounding knife driving shaft and comprises a grounding knife driving cam plate and an isolating knife driving cam plate; a phase angle difference is arranged between the two cam plates, so that the isolating knife is in a closed position and the grounding knife is in an open position, or the isolating knife is in an open position and the grounding knife is in a closed position. The isolating knife and the grounding knife are driven by a single direct-current speed reduction motor linkage, inherent interlocking is realized by using a cam phase angle difference, an independent interlocking mechanism is not needed, the structure is simplified, the cost is reduced, and the operation reliability is improved.

Description

Technical Field

[0001] This invention relates to the technical field of power switchgear, and more particularly to a disconnecting switch with a grounding blade and its operating method. Background Technology

[0002] Disconnecting switches with grounding switches are key devices in power systems used to isolate power sources and provide protective grounding. Their core requirement is to ensure that the main circuit forms a visible break while providing reliable grounding protection for maintenance personnel, and it is essential to prevent the disconnecting switch and the grounding switch from being closed at the same time.

[0003] Existing disconnect switches with grounding switches typically employ a dual independent drive system, where the disconnecting switch is driven by an electric operating mechanism and the grounding switch is driven by a manual operating mechanism, with the two drive systems operating independently of each other. Additionally, an independent mechanical interlocking mechanism, such as a four-bar linkage interlocking mechanism, is installed between the main disconnect switch drive mechanism and the grounding switch drive mechanism, achieving interlocking through the physical stops of the crank arms and linkages.

[0004] The aforementioned existing technology has the following drawbacks: First, the dual independent drive system results in a large number of parts, complex structure, and large space occupation, and the manual drive grounding switch cannot meet the automation requirements of unattended or remote operation; Second, the independently set interlocking mechanism increases the assembly difficulty and failure points, and the separation of the interlocking function from the transmission function makes the overall structure redundant; Third, the lack of a handle detection switch means that the motor control circuit cannot be automatically cut off in manual operation mode, posing a safety hazard of motor malfunction and injury. Summary of the Invention

[0005] The purpose of this invention is to provide a disconnecting switch with a grounding blade and its operation method to solve the above-mentioned technical problems.

[0006] The technical solution adopted in this invention is as follows: A disconnecting switch with a grounding switch includes a base frame, an isolating switch, and a grounding switch, wherein the isolating switch and the grounding switch are both mounted on the base frame, and further includes: A DC geared motor is located on one side of the base frame; The grounding switch drives the gear set, which is connected to the output terminal of the DC geared motor; An isolation knife drive shaft is rotatably mounted on the base frame, and an isolation knife is mounted on the isolation knife drive shaft; A grounding knife drive shaft is rotatably mounted on the base frame. A grounding knife is mounted on the grounding knife drive shaft, and one end of the grounding knife drive shaft is connected to the grounding knife drive gear set. A transmission assembly, wherein the transmission assembly is connected to one end of the isolating knife drive shaft and the grounding knife drive shaft; There is a phase angle difference between the grounding switch driving cam plate and the isolating switch driving cam plate. When the isolating switch is in the closed position, the grounding switch is in the open position. When the grounding switch is in the closed position, the isolating switch is in the open position.

[0007] Preferably, the system also includes a gearbox mounting bracket and a handle detection switch. The gearbox mounting bracket is provided on one side of the base frame, the DC geared motor is located at the upper end of the gearbox mounting bracket, and the handle detection switch is electrically connected to the DC geared motor.

[0008] Preferably, the transmission assembly includes: A grounding switch drive cam plate is disposed at one end of the grounding switch drive shaft; A cam plate for driving the isolation blade is connected to one end of the isolation blade drive shaft; A cam drive rod is rotatably connected to the base frame. One end of the cam drive rod is slidably connected to the isolation knife drive cam plate, and the other end is slidably connected to the grounding knife drive cam plate.

[0009] As a further preferred embodiment, the system also includes an isolating switch limit switch group and a grounding switch limit switch group. Both the isolating switch limit switch group and the grounding switch limit switch group are located on the other side of the base frame. The isolating switch limit switch group is located at the open and closed positions of the isolating switch and on both sides of the other end of the isolating switch drive shaft. The grounding switch limit switch group is located at the open and closed positions of the grounding switch and on both sides of the other end of the grounding switch drive shaft. An isolating switch auxiliary switch is provided at the other end of the isolating switch drive shaft, and a grounding switch auxiliary switch is provided at the other end of the grounding switch drive shaft.

[0010] Preferably, the system also includes an upper busbar and a middle busbar. The isolating knife includes an isolating knife body and an isolating knife connecting rod. One end of the isolating knife body is rotatably connected to the middle busbar, and one end of the isolating knife connecting rod is rotatably connected to the isolating knife body. The other end of the isolating knife body is connected to the isolating knife drive shaft. One end of the grounding knife is connected to the grounding knife drive shaft, and the other end of the grounding knife cooperates with the middle busbar.

[0011] As a further preferred embodiment, it also includes wiring terminals, which are disposed on the base frame and located on both sides of the DC geared motor.

[0012] As a further preferred embodiment, it also includes insulating terminals, with the upper bus and the middle bus respectively connected to the base frame via the insulating terminals.

[0013] As a further preferred embodiment, the grounding knife driving cam plate and the isolation knife driving cam plate are respectively provided with arc-shaped guide holes, and both ends of the cam drive rod are provided with cylinders, which are slidably disposed in the arc-shaped guide holes.

[0014] As a further preferred embodiment, the cam drive rod is arranged in a V-shape, and the included angle of the cam drive rod is 134°~135°.

[0015] An operating method for a disconnecting switch with a grounding switch, comprising the disconnecting switch with a grounding switch, the operating method comprising: S1. Receive the operation command and start the DC geared motor; S2. The DC geared motor drives the grounding knife drive shaft to rotate via the grounding knife drive gear set. The grounding knife drive shaft causes the grounding knife to swing. At the same time, the grounding knife drive shaft drives the isolation knife drive shaft to rotate via the transmission assembly. The isolation knife drive shaft causes the isolation knife to swing. By utilizing the shape of the cam drive rod and the phase angle difference between the grounding knife drive cam plate and the isolation knife drive cam plate, the isolation knife and the grounding knife exhibit reciprocal motion. S3. The position of the isolating knife and the grounding knife is detected by the isolating knife limit switch group and the grounding knife limit switch group. When the isolating knife or the grounding knife moves to the corresponding position, the limit switch group outputs a position signal to control the DC geared motor to stop running.

[0016] The above technical solution has the following advantages or beneficial effects: (1) In this invention, by setting a single drive source in conjunction with a gear and a double cam plate composite transmission system, only one DC geared motor is needed to synchronously drive the opening and closing operations of the isolation knife and the grounding knife. Compared with the dual independent drive method in the prior art, a set of independent operating mechanisms is reduced, the number of parts and manufacturing costs are reduced, and at the same time, fully electric operation is realized, which is suitable for unattended or remote control application scenarios.

[0017] (2) In this invention, by setting the phase angle difference between the grounding knife driving cam plate and the isolating knife driving cam plate, the interlocking function is embedded in the cam transmission system itself, without the need for an additional independent interlocking mechanism, which simplifies the overall structure, reduces assembly links and fault points, and the kinematic characteristics of the cam mechanism can accurately control the motion trajectory and speed curve of the knife switch, thereby improving the dynamic performance of the opening and closing process. Attached Figure Description

[0018] Figure 1 This is a perspective view of the isolating switch closing and the grounding switch opening in this invention; Figure 2 This is a schematic diagram showing the cooperation between the cam drive rod, the grounding knife drive cam plate, and the isolating knife drive cam plate when the isolating knife is closed and the grounding knife is opened in this invention. Figure 3 This is a perspective view of the isolating switch and the grounding switch being tripped in this invention; Figure 4 This is a schematic diagram showing the cooperation between the cam drive rod and the grounding knife drive cam plate when the isolating knife is tripped and the grounding knife is tripped in this invention; Figure 5 This is a perspective view of the isolating switch being opened and the grounding switch being closed in this invention; Figure 6 This is a schematic diagram showing the cooperation between the cam drive rod, the grounding knife drive cam plate, and the isolating knife drive cam plate when the isolating knife is opened and the grounding knife is closed in this invention.

[0019] In the diagram: 1. Base frame; 2. Upper busbar; 3. Isolator drive shaft; 4. Isolator; 5. Isolator limit switch assembly; 6. Middle busbar; 7. Grounding limit switch assembly; 8. Grounding; 9. Grounding drive shaft; 10. Gearbox mounting bracket; 11. Terminal block; 12. DC geared motor; 13. Handle detection switch; 14. Grounding drive gear assembly; 15. Grounding drive cam plate; 16. Cam drive rod; 17. Isolator drive cam plate; 18. Insulating terminal; 19. Isolator connecting rod; 20. Isolator body; 21. Arc-shaped guide hole. Detailed Implementation

[0020] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be noted that terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] Please see Figures 1 to 6 As shown, a disconnecting switch with a grounding blade is illustrated, comprising: The base frame 1 is the supporting foundation for the entire disconnecting switch. It has a rectangular frame structure. The base frame 1 is equipped with the isolating knife 4 and the grounding knife 8. Both the isolating knife 4 and the grounding knife 8 are located on the base frame 1. The DC geared motor 12 is located on one side of the base frame 1. The DC geared motor 12 serves as the sole power source, providing the driving force required for the opening and closing operations of the isolating switch 4 and the grounding switch 8. The grounding knife drive gear set 14 is connected to the output terminal of the DC geared motor 12. The grounding knife drive gear set 14 reduces the speed output by the DC geared motor 12 and increases the torque before transmitting it to the subsequent transmission components. Isolating knife drive shaft 3 is rotatably mounted on base frame 1. Isolating knife 4 is mounted on isolating knife drive shaft 3. When isolating knife drive shaft 3 rotates, it drives isolating knife 4 to swing around the axis of isolating knife drive shaft 3, thereby realizing the opening and closing of isolating knife 4. A grounding switch drive shaft 9 is rotatably mounted on a base frame 1. A grounding switch 8 is mounted on the grounding switch drive shaft 9. One end of the grounding switch drive shaft 9 is connected to a grounding switch drive gear set 14. When the grounding switch drive gear set 14 rotates, it directly drives the grounding switch drive shaft 9 to rotate, thereby causing the grounding switch 8 to swing around the axis of the grounding switch drive shaft 9, thus realizing the opening and closing of the grounding switch 8. The grounding switch drive shaft 9 is arranged parallel to the isolating switch drive shaft 3. The grounding switch drive gear set 14 includes a driving gear and a driven gear. The driving gear is connected to the output end of the DC geared motor 12, and the driven gear is connected to one end of the grounding switch drive shaft 9.

[0024] The transmission assembly is connected to one end of the isolating knife drive shaft 3 and the grounding knife drive shaft 9. The transmission assembly transmits the power of the grounding knife drive shaft 9 to the isolating knife drive shaft 3, so that the isolating knife 4 and the grounding knife 8 can be driven by the same DC geared motor 12. A phase angle difference is provided between the grounding knife drive cam plate 15 and the isolating knife drive cam plate 17. By setting the phase angle difference between the two cam plates, the grounding knife 8 is in the open position when the isolating knife 4 is in the closed position, and the isolating knife 4 is in the open position when the grounding knife 8 is in the closed position. This achieves the inherent interlock between the isolating knife 4 and the grounding knife 8 at the mechanical level, without the need to set up an independent interlocking mechanism.

[0025] In this embodiment, the DC geared motor 12 is located on one side of the base frame 1. The DC geared motor 12 drives the grounding knife drive shaft 9 to rotate via the grounding knife drive gear set 14. The grounding knife drive shaft 9 then transmits power to the isolating knife drive shaft 3 via a transmission assembly. The isolating knife drive shaft 3 and the grounding knife drive shaft 9 are arranged parallel to each other on the base frame 1, side by side in the horizontal direction. There are two isolating knives 4 and two grounding knives 8 are located on the grounding knife drive shaft 9. When the DC geared motor 12 starts, the driving gear drives the driven gear to rotate, and the driven gear drives the grounding knife drive shaft 9 to rotate. The grounding knife drive shaft 9 drives the isolating knife drive shaft 3 to rotate via the transmission assembly, so that the isolating knife 4 and the grounding knife 8 are driven by the same power source and exhibit reversible motion due to the phase angle difference of the cam, realizing that one is closed while the other is opened.

[0026] In this embodiment, there is a phase angle difference between the grounding switch driving cam plate 15 and the isolating switch driving cam plate 17. The two cam plates are respectively located at one end of the grounding switch driving shaft 9 and the isolating switch driving shaft 3, but their cam profiles are offset by a certain angle in the circumferential direction. When the isolating switch driving cam plate 17 rotates to the phase corresponding to the closing of the isolating switch 4, the phase of the grounding switch driving cam plate 15 is exactly in the locking region, and it cannot drive the grounding switch 8 to close; conversely, the opposite is also true. This inherent interlocking function achieved through the cam phase difference fundamentally eliminates the possibility of the isolating switch 4 and the grounding switch 8 closing simultaneously.

[0027] Furthermore, as a preferred embodiment, it also includes a gearbox mounting bracket 10 and a handle detection switch 13. The gearbox mounting bracket 10 is provided on one side of the base frame 1 and is fixed to the side of the base frame 1 by bolts. The DC geared motor 12 is located at the upper end of the gearbox mounting bracket 10. The gearbox mounting bracket 10 supports and positions the DC geared motor 12, ensuring the stability of the DC geared motor 12 during operation. The handle detection switch 13 is electrically connected to the DC geared motor 12. When the operator inserts the manual operating handle, the handle detection switch 13 is triggered and operates, cutting off the control circuit of the DC geared motor 12, preventing the DC geared motor 12 from starting, thereby preventing accidental motor operation and potential injury in manual operation mode. When the manual operating handle is pulled out, the handle detection switch 13 resets, the control circuit of the DC geared motor 12 returns to normal, and electric operation can be performed.

[0028] Furthermore, in a preferred embodiment, the transmission assembly includes a grounding knife drive cam plate 15, an isolating knife drive cam plate 17, and a cam drive rod 16. The grounding knife drive cam plate 15 is disposed at one end of the grounding knife drive shaft 9 and rotates synchronously with the grounding knife drive shaft 9. The isolating knife drive cam plate 17 is connected to one end of the isolating knife drive shaft 3 and rotates synchronously with the isolating knife drive shaft 3. The cam drive rod 16 is rotatably connected to the base frame 1, and the middle part of the cam drive rod 16 is hinged to the base frame 1 via a pivot, allowing the cam drive rod 16 to swing around its middle pivot. One end of the cam drive rod 16 is slidably connected to the isolating knife drive cam plate 17, and the other end is slidably connected to the grounding knife drive cam plate 15.

[0029] In this embodiment, when the DC geared motor 12 drives the grounding switch drive gear set 14 to rotate, the grounding switch drive shaft 9 drives the grounding switch drive cam plate 15 to rotate synchronously. The grounding switch drive cam plate 15 engages with the cylinder at the end of the cam drive rod 16 through its arc-shaped guide hole, pushing one end of the cam drive rod 16 to slide, causing the cam drive rod 16 to swing around its central axis. The other end of the cam drive rod 16 then slides in the arc-shaped guide hole of the isolating switch drive cam plate 17, driving the isolating switch drive cam plate 17 to rotate, which in turn drives the isolating switch drive shaft 3 to rotate, thus realizing the opening and closing of the isolating switch 4. This composite transmission structure formed by the cam and the connecting rod allows a single motor to drive two switches synchronously, and the curve shape of the arc-shaped guide hole can precisely control the movement speed and acceleration of the switches, optimizing the opening and closing dynamics.

[0030] Furthermore, as a preferred embodiment, it also includes an isolating switch limit switch group 5 and a grounding switch limit switch group 7. Both the isolating switch limit switch group 5 and the grounding switch limit switch group 7 are located on the other side of the base frame 1, separately from the DC geared motor 12 on both sides of the base frame 1. The isolating switch limit switch group 5 is located at the open and closed positions of the isolating switch 4, and on both sides of the other end of the isolating switch drive shaft 3. When the isolating switch 4 reaches its open or closed limit position, the other end of the isolating switch drive shaft 3 contacts the corresponding limit switch, sending a position signal. The grounding switch limit switch group 7 is located at the open and closed positions of the grounding switch 8, and on both sides of the other end of the grounding switch drive shaft 9. Its working principle is the same as that of the isolating switch limit switch group 5. An isolating switch auxiliary switch is provided at the other end of the isolating switch drive shaft 3. When the isolating switch auxiliary switch contacts the isolating switch limit switch group 5, it can trigger a feedback signal. Similarly, a grounding switch auxiliary switch is provided at the other end of the grounding switch drive shaft 9. When the grounding switch auxiliary switch contacts the grounding switch limit switch group 7, it can trigger a feedback signal.

[0031] Furthermore, as a preferred embodiment, it also includes an upper busbar 2 and a middle busbar 6. Both the upper busbar 2 and the middle busbar 6 are located above the base frame 1. The isolating knife 4 includes an isolating knife body and an isolating knife connecting rod 19. One end of the isolating knife body is rotatably connected to the middle busbar 6, allowing the isolating knife body to swing around the connection point with the middle busbar 6. One end of the isolating knife connecting rod 19 is rotatably connected to the isolating knife body, and the other end of the isolating knife connecting rod 19 is connected to the isolating knife drive shaft 3. When the isolating knife drive shaft 3 rotates, the isolating knife body is driven to swing around the connection point of the middle busbar 6 through the isolating knife connecting rod 19, realizing the contact and separation of the isolating knife 4 and the upper busbar 2. One end of the grounding knife 8 is connected to the grounding knife drive shaft 9, and the other end of the grounding knife 8 cooperates with the middle busbar 6. When the grounding knife 8 is closed, its free end contacts the middle busbar 6, directly grounding the isolated three-phase line.

[0032] In this embodiment, the upper busbar 2 serves as the incoming line terminal, and the middle busbar 6 serves as the outgoing line terminal and grounding contact. When the isolating switch 4 is closed, the upper end of the isolating switch body contacts the upper busbar 2, and the lower end contacts the middle busbar 6, forming a main circuit conduction path. When the isolating switch 4 is open, the isolating switch body separates from the upper busbar 2, forming a visible break point that meets the safety distance requirement, physically isolating the maintenance equipment from the high-voltage power supply. It should be noted that the isolating switch 4 has no arc-extinguishing capability and is strictly prohibited from operation under load. When the grounding switch 8 is closed, the free end of the grounding switch 8 contacts the middle busbar 6, directly grounding the three phases on the isolated equipment side, achieving the following safety functions: discharging residual charge and induced voltage; if accidental power supply occurs, it can cause a short circuit, prompting the upper protection to trip quickly; it constitutes a working grounding state, ensuring the safety of personnel. The setting of the isolating switch connecting rod 19 converts the movement of the isolating switch 4 into a swing around the connection point of the middle busbar 6, reducing the driving torque required for the isolating switch drive shaft 3. It should be noted that the grounding switch 8 is only used for temporary grounding during maintenance and does not carry normal load current, but it must have the ability to withstand short-term short-circuit current. Its grounding nature is protective grounding, not lightning protection or system working grounding, and it is a key measure in the "five defenses" of the power system.

[0033] Furthermore, as a preferred embodiment, it also includes terminal blocks 11. Terminal blocks 11 are mounted on the base frame 1 and located on both sides of the DC geared motor 12, used to realize electrical connections between the DC geared motor 12 and external control power supplies, as well as electrical components such as the handle detection switch 13, the isolating blade limit switch group 5, and the grounding blade limit switch group 7. The terminal blocks 11 are centrally arranged on both sides of the DC geared motor 12, facilitating wiring and maintenance, while also keeping electrical wiring neat and reducing cable crossings.

[0034] Furthermore, as a preferred embodiment, an insulating terminal 18 is also included. The upper bus 2 and the middle bus 6 are respectively connected to the base frame 1 via the insulating terminal 18, which is located between the upper bus 2 and the base frame 1, and between the middle bus 6 and the base frame 1. The insulating terminal 18 is made of insulating material and can withstand high-voltage insulation requirements, thus forming reliable electrical isolation between the upper bus 2 and the middle bus 6 and the base frame 1, preventing live parts from conducting with the base frame 1, and ensuring safe equipment operation.

[0035] Furthermore, as a preferred embodiment, the grounding knife drive cam plate 15 and the isolating knife drive cam plate 17 are respectively provided with arc-shaped guide holes, and both ends of the cam drive rod 16 are provided with cylinders, which are slidably disposed in the arc-shaped guide holes. When the grounding knife drive cam plate 15 rotates with the grounding knife drive shaft 9, the cylinders at the ends of the cam drive rod 16 slide in the arc-shaped guide holes, converting the rotational motion of the grounding knife drive cam plate 15 into the oscillating motion of the cam drive rod 16. The curve shape of the arc-shaped guide hole determines the motion law of the cam drive rod 16, thereby controlling the motion speed and acceleration curves of the grounding knife and the isolating knife.

[0036] Furthermore, as a preferred embodiment, the cam drive rod 16 is generally V-shaped, and the included angle of the cam drive rod 16 is 134°~135°. In this embodiment, the included angle of the cam drive rod 16 can specifically be 135°.

[0037] In use, this invention has three working states. State 1 is the normal operating state. Upon receiving an operation command, the DC geared motor 12 starts, driving the grounding knife drive shaft 9 to rotate via the grounding knife drive gear set 14. The grounding knife drive shaft 9 directly drives the grounding knife 8 to swing. Simultaneously, the grounding knife drive shaft 9 drives the isolating knife drive shaft 3 to rotate via the cam drive rod 16 in the transmission assembly, which in turn drives the isolating knife 4 to swing via the isolating knife connecting rod 19, placing the isolating knife 4 in the closed position and the grounding knife 8 in the open position. At this time, the main circuit is connected, and the equipment operates normally. State 2 is the maintenance isolation state. The isolating knife 4 is open while the grounding knife 8 remains in the open position. At this time, the isolating knife 4 separates from the upper busbar 2, forming a visible break point that meets the safety distance requirement, physically isolating the equipment under maintenance from the high-voltage power supply, preparing for maintenance. State 3 is the maintenance grounding state. The isolating knife 4 remains in the open position while the grounding knife 8 is closed. The free end of the grounding knife 8 contacts the middle busbar 6, directly grounding the isolated three phases on the equipment side, discharging residual charge and induced voltage, constituting a working grounding state, ensuring the safety of maintenance personnel. Due to the phase angle difference between the grounding switch drive cam plate 15 and the isolating switch drive cam plate 17, the isolating switch 4 and the grounding switch 8 are always in a reversible state, fundamentally eliminating the possibility of both being closed simultaneously. When manual operation is required, the operator inserts the manual operation handle, the handle detection switch 13 is activated, and the control circuit of the DC geared motor 12 is cut off, ensuring that the motor will not malfunction during manual operation.

[0038] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A disconnecting switch with a grounding switch, comprising a base frame, a disconnecting switch, and a grounding switch, wherein the disconnecting switch and the grounding switch are both mounted on the base frame, characterized in that, Also includes: A DC geared motor is located on one side of the base frame; The grounding switch drives the gear set, which is connected to the output terminal of the DC geared motor; An isolation knife drive shaft is rotatably mounted on the base frame, and an isolation knife is mounted on the isolation knife drive shaft; A grounding knife drive shaft is rotatably mounted on the base frame. A grounding knife is mounted on the grounding knife drive shaft, and one end of the grounding knife drive shaft is connected to the grounding knife drive gear set. A transmission assembly is connected to one end of the isolating knife drive shaft and the grounding knife drive shaft. The drive assembly includes a grounding knife drive cam plate and an isolating knife drive cam plate. There is a phase angle difference between the grounding switch driving cam plate and the isolating switch driving cam plate. When the isolating switch is in the closed position, the grounding switch is in the open position. When the grounding switch is in the closed position, the isolating switch is in the open position.

2. A disconnecting switch with a grounding blade as described in claim 1, characterized in that: It also includes a gearbox mounting bracket and a handle detection switch. The gearbox mounting bracket is provided on one side of the base frame, the DC geared motor is located at the upper end of the gearbox mounting bracket, and the handle detection switch is electrically connected to the DC geared motor.

3. A disconnecting switch with a grounding blade as described in claim 1, characterized in that: The transmission assembly further includes a cam drive rod, and the grounding knife drive cam plate is disposed at one end of the grounding knife drive shaft; the isolation knife drive cam plate is connected to one end of the isolation knife drive shaft; The cam drive rod is rotatably connected to the base frame. One end of the cam drive rod is slidably connected to the isolation knife drive cam plate, and the other end is slidably connected to the grounding knife drive cam plate.

4. A disconnecting switch with a grounding blade as described in claim 3, characterized in that: It also includes an isolating switch limit switch group and a grounding switch limit switch group. Both the isolating switch limit switch group and the grounding switch limit switch group are located on the other side of the base frame. The isolating switch limit switch group is located at the open and closed positions of the isolating switch and is located on both sides of the other end of the isolating switch drive shaft. The grounding switch limit switch group is located at the open and closed positions of the grounding switch and is located on both sides of the other end of the grounding switch drive shaft. An isolating switch auxiliary switch is provided at the other end of the isolating switch drive shaft, and a grounding switch auxiliary switch is provided at the other end of the grounding switch drive shaft.

5. A disconnecting switch with a grounding blade as described in claim 1, characterized in that: It also includes an upper bus and a middle bus. The isolating knife includes an isolating knife body and an isolating knife connecting rod. One end of the isolating knife body is rotatably connected to the middle bus. One end of the isolating knife connecting rod is rotatably connected to the isolating knife body. The other end of the isolating knife body is connected to the isolating knife drive shaft. One end of the grounding knife is connected to the grounding knife drive shaft. The other end of the grounding knife cooperates with the middle bus.

6. A disconnecting switch with a grounding blade as described in claim 2, characterized in that: It also includes wiring terminals, which are located on the base frame and on both sides of the DC geared motor.

7. A disconnecting switch with a grounding blade as described in claim 5, characterized in that: It also includes insulating terminals, and the upper bus and the middle bus are respectively connected to the base frame through the insulating terminals.

8. A disconnecting switch with a grounding blade as described in claim 3, characterized in that: The grounding knife drive cam plate and the isolation knife drive cam plate are respectively provided with arc-shaped guide holes, and both ends of the cam drive rod are provided with cylinders, which are slidably disposed in the arc-shaped guide holes.

9. A disconnecting switch with a grounding blade as described in claim 3, characterized in that: The cam drive rod is V-shaped, and the included angle of the cam drive rod is 134°~135°.

10. A method for operating a disconnecting switch with a grounding switch, comprising the disconnecting switch with a grounding switch as described in any one of claims 1-9, characterized in that, The operation method includes: S1. Receive the operation command and start the DC geared motor; S2. The DC geared motor drives the grounding knife drive shaft to rotate via the grounding knife drive gear set. The grounding knife drive shaft causes the grounding knife to swing. At the same time, the grounding knife drive shaft drives the isolation knife drive shaft to rotate via the transmission assembly. The isolation knife drive shaft causes the isolation knife to swing. By utilizing the shape of the cam drive rod and the phase angle difference between the grounding knife drive cam plate and the isolation knife drive cam plate, the isolation knife and the grounding knife exhibit reciprocal motion. S3. The position of the isolating knife and the grounding knife is detected by the isolating knife limit switch group and the grounding knife limit switch group. When the isolating knife or the grounding knife moves to the corresponding position, the limit switch group outputs a position signal to control the DC geared motor to stop running.

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